Pump jack



May 17, 1927. 1,628,702

W. E. WENTWORTH PUMP JACK Filed July 13, 1926 2 Sheets-Sheet 1 PatentedMay 17, 1927.

UNITED STATES WILLIAM E. WENTWORTH PUMP Application filed July 13,

This invention relates to improvements in pump jacks and has as itsgeneral object to provide a pump jack which will be steady and positivein its operation and simple 1n construction, and which will embodylmeans whereby the stroke of the pump rod may be varied as occasionrequires.

` Another object of the invention is to'provide a pump jack which maybe` operatively 1o connected with the pump rod regardless of thedistance to which the rodextends above the ground surface, therebyobviating-adjustment which would otherwise be required in operativelyassembling the pump jack with the said rod.

In the accompanying drawings:

Figure 1 is a side elevation of the pump jack embodying the invention.

Figure 2 is a front elevation of the lower portion of the pump jack. t

Figure 3 is a detail plan View of the upper end olf the swinging post ofthe jack and the connection provided between the same and the liexibleelement which leads to the pump rod. l

Figure Ll is a detail horizontal sectional view taken substantially onthe line -Jl of Figure 1, looking in the direction indicated by thearrows.

Figure 5 is a similar View on the line 5-5 of Figure 1, looking in thedirection indicated by the arrows.

Figure (3 is a detail horizontalsectional View on the line 6-6 of Figure1, looking in the direction indicated by the arrows. t

l Figure 7 is a similar view on the line 7-7 of Figure 1, illustrating`the connection b'etween the liexible motion transmitting member` of thejack and the pump rodto be reciprocated.

, The jack embodying the invention con prises a pair of base sills 1which are preferably embedded in the ground adjacent the pump'casing2and upon which sills are mounted base platesy 3 and 4 bolted orotherwise secured in place and support-ing the parts comprising thestructure7 the plates serving likewise to relativay brace the saidsillst so that thek structure will be supported ina substantial manner.The numeral 5 in-V dicates in general an upright comprising a pair ofchannel beams between the lower ends ot which there is bolted `orotherwise secured the lat-sided shank 7 ot a pivot member 8 which isprovided at the lower endy ot its shank with shoulders 9 upon llafdPATENT OFFICE.

, 0F SAN ANTONIO, TEXAS.

JACK.

1926. Serial N0. 122,223.

:which the Vlower ends ot the said channel beams rest. as clearly shownin Figures 1 and of the drawings. The pivot member 8 is disposed betweentwo bearings 10which are cast upon the plate 3, and a short shaft 11 isjournaled in the said bearings and eX- tends through an opening in thesaid pivot member 8 so as to support the upright comprising the channelbeams 6 normally in an upright position and yet` permit of downwardswinging movement thereof under conditions to be presently explained.Disposed between the upper portions ot the beams and bolted or otherwisesecured in place, is a head 12 having shoulders l3nt its opposite sidesengaging the rear sides of the channel members 6, the head 12 beingformed with va pair of spaced ears 141. rThe numeral 15 indicates abrace for `maintaining the upright 5 in vertical position7 and thisbrace comprises an eye beanithe web of which is cut away at its upperend so asr to accommodate the ears 111-, a pivot bolt 16 being littedthrough the side flanges ot' the eye beam at the said upper end thereofand through the said ears, as clearly shown in Figure 4 of the drawings.The lower end of the brace 15 has its web cut away in a similarniannerso that its side anges at its said end will straddle spaced ears 17which are integrally formed upon the base plate l and extend forwardlytherefromJ a bolt 18 being iitted through the said ears 17 and throughthe said liangesof the brace 15, as shown in Figure 5, so as to securethe said end of the brace to the base plate.

Bearings 19 are formed upon the base plate 4, and a shaft 20 isjournaled in the said bearings and extends through alined f openings inplates 21 which are bolted, as at 22, to the opposite sides of a rockingbeam 23, the said plates having side flanges 24 engaging the oppositeedges of the said beam. The numeral 24 indicates in general a saddlemember which is mountedat the upper end of the rocking beam 23 andcomprises a body 25 having spaced ears 26 straddling the rearedge of thesaid beam 23 at itsupper end, Aa bolt 27 being fitted through the saidears and through said beamy Y to secure the body 25 to the beam. Thebody is formed with a transverserecessor seat 28 in whichl is engagedone end of a rectangular link 29, and ahook 30 is connected to theotherend of the link, the link straddling the upper end of thel beam,v andone rod 31 of an adjustable connection comprising a threaded rod 32 anda turn-buckle 33, is secured to the shank of the said hook 30, the rod32 of the adjustable connection being connected as at 34, to one end ofa sprocket chain which is indicated by the numeral 35 and which passesabout a sprocket gear 36 mounted upon Aa shaft journaled in bearings 3Ssecured in the channels of the vmembers 6 of the upright at their upperends. The other `end of the sprocket chain 35 is connected, in a mannerwhich will now be described, with the pump rod, which is indicated bythe numeral 3S).

The means provided for connecting'the last mentioned end of the chain 35with the pum-p rod 39 comprises a clamp consisting o-f-a ymember 40which is provided in oneside with an :approximately semi-cylindricalrecess or `seat 41 to embrace one side of the said -pump rod 39, and thesaid member is provided with a pair of upstanding ears 42 between 'whichand an intermediate upstanding portion 43, `the leaves of the lowermostllink of said chain at its said end are received, these Vleaves beingindicated by the numeral 44. A bolt 45 is fitted through the said earsand the said portion 43 and likewise through the link leaves and servesto connect `the chain to the said clamp member. The Iother member of theclamp, indicated by the numeral 46, is likewise provided with anapproximately semi-cylindrical seat 47 to embrace the other side of thesaid pump frod,

' and bolts 48 lare secured `through .the said members 40 Iand 46 andare tightened to clamp `the rod. The numeral 49 indicates is providedwithvspaced ears 51 which stradan :eye member is connected with thechain 35 above *the clamp just described, and this eye member'accommodates a portion lof the rod above lthat portion which is engagedbetween `the clamping members v40 and 46, and

in Ithis manner, lthe kchain ris adapted to have a substantially rigidtwo-point connection with the rod so as to insure offsteady 'verticalreoiprocation thereof, and it will be understood lat thisapoint `thatthe means provided for 'connecting the chain to lthe rod lpermits ofadaptation of the chain `to pump rods regardless yof the distance to`whichthey ueX- tendabove the supper end fof the pump `casing, so thatan adjustment is provided at this `polnt obviating the necessity ofmaking the adjustment at the point of location of the turnbuckle 33,vthis latter adjustment "being made use of after the. chain )has beenconnected with `the pump rod, if `it sliouldbe found necessary to effectfurther very slight adjustment.

4The numeral 50 indicates in general a saddle member correspondinertothe saddle member 24, and this said saddle member 5() die `:theforward vedge of the upright beam 28, a bolt 52 being fitted through thesaid gaged 'one end of a link 55 of the same w formation as the link 29,and a hook 56 is engaged with the other end of the link and hasconnected 'to it one end of the cable 5T which leads to the usualoperating means for ythe jack (not shown). At this point it will `beevident that by vertically adjusting the saddle 50 upon the rocking beam53, the throw ofthe beam may be adjusted so as to vary the length of thestroke imparted tothe pump rod 39.

From the foregoing description Iof sthe -invention it will be seen thatthere is provided an exceptionally substantial and durable constructionof pump jack which will `operate to impart a steady reciprocatory motiontothe pump rod with which it is connected and the Athrow of the rockingbeam of which jack may be conveniently varied so as to vary the lengthof stroke of fthe pump rod. It will also ab'e evident vthat when itisdesired to pull the well, the jack may be readily folded into compactform by disconnecting the yclamp 40 and the eye `member 49 from the pumprod, removing the bolt 18 or the bolt 16, either as may be `desired orVfound expedient, lowering `the upright 5, and swinging the rocking beam23 downwardly, so that the vparts will `all occupy a position extendingabove the said structure of the device.

`Having thus described the invention, what I claim is:

1. In a pump jack, base sills, a baseplate mounted thereon andiconnecting vthe same near one end, bearings upon ythe said base plate,a shaft mounted in the bearings, la bea-ring member V-upon the shaft-betweensaid bearings, spaced uprights secured at their lower ends tothe saidbearing member 'at opposite 'sides thereof, a wheel journaledfor rotation between the upper ends ofv the uprights, a bracket having ashank secured between said uprights and side arms extendingacross theuprights to brace the bracket, a base plate mounted upon 'the sills nearthe other :ends thereof and Iconnecting the same, a 'brace connectedpivotally at its upper end to said bracket and at its lower endseparably connected to the last mentioned base pla-te, a rocking beamymounted upon the 'last mentioned base plate, means 'for impartingrocking motion to the beam, a Hexible element connected to the beam'a'ndpassed over the said wheel, and means carried by the fiexible elementfor connection to a pump rod.

2. In a pump jack, a' base structure, an upright mounted thereon, awheel journaled upon the upright, a beam mounted for rocking movementupon the upright and `having a plurality of openings arranged in aseries extending parallel to one edge thereof, a saddle having` aportion straddling the other` edge of the beam at the upper end thereofand provided with a seat, a fastener extend ing transversely through thesaddle and beam, a link engaged at one end in the seat and straddlingthe said end of the beam, a flexible element connected to the said linkand passing over the said Wheel, means ear ried by the flexible elementat the other end thereof for connecting the same to a pump rod, a secondsaddle disposed to straddle the first mentioned edge of the beam andhaving openings therein for registration with the openings in the beamselectively, a bolt fitted through the openings in the second mentionedsaddle and .interchangeably in the openings in the said beam, the saddlehaving a seat, and a link engaged at one end in the seat in the secondmentioned saddle and straddling the beam for the connection thereto ofmeans for imparting rocking motion to the said beam.

2S. In a pump jack, an upright, a Wheel .mounted thereon, a rockingbeam, means for imparting rocking motion to the beam, a flexible elementconnected to the rocking beam and trained over said wheel, a Clamp atthe lower end of the said flexible element for connection With a pumprod to clamp the same at a point in its length, and a member carried bythe flexible element and spaced above the clamp to engage the said pumprod at a point above the point at which it is engaged by the clamp.

ln a pump jack, an upright, a sprocket gear mounted for rotation at theupper end of the upright, a rocking beam mounted at its lower end foroscillatory movement in spaced relation to the upright, a saddle ad-`justably mounted on saidfbeam, a sprocket chain trained about thesprocket gear, means at one end of said chain clamping the same to apump rod, a link disposed about said' beam and engaged with the saddle,means connected With the chain and detaehably engaging said link at theopposite side of thebeam from said saddle, and means for oscillating'the said rocking beam.

In testimony whereof I affix m. sio'nature.

WlLLIAM E. WENTVVORTL L. sfj.r

